FlexCAN flexcan_interrupt example

[jbrud]

Hi Guys,

the flexcan_interrupt example does not work for me with MCUXpressoSDK 2.5.0 at all. I followed the the steps of the readme.txt but  since I have only one TWR-K64F120M+TWR-SER set of boards, I used a FRDM-K64F + self-made PCA82C251 board. I copied the board related files ( pin_mux, board, clock_config ...)  from the loopback example of frdm-k64f. Additionally I added the initialization of the pins PB18 &  PB19 like it is done for TWR-K64F120M. I measured the signals of CANL and CANH  and it seems ok. Any Ideas what could be going wrong here ?

It would be nice if someone which have two sets of TWR-K64F120M+TWR-SER could double check if it is working at his desk.

[jbrud]

Hi Daniel,

thanks for checking on your desk. In the meantime I got it working as well. There were different problems together.

One of them which could be interesting for others was that the pin numbering of TWR-SER-SCH.pdf is:

and the readme.txt of flexcan_interrupt demo says something different:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      PINS NAME        TWR-SER1     CONNECTS TO    TWR_SER2
      CANL                   J7 PIN 1                                          J7 PIN 1
      GND                     J7 PIN 2                                          J7 PIN 2
      CANH                   J7 PIN 3                                          J7 PIN 3
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Sure if you have two twr-k64 +twr-ser combos it will work since you are doing the same failure on both sides...

Best Regards,

Johannes

[danielchen]

Thanks Johannes,  strange that no one found this before.  I will report this .

Regards

Daniel

[danielchen]

Hi Johannes:

I did a quick check  the flexcan_interrupt demo with two twr-k64 boards, it can work on my side.

I would suggest you see below two threads for CAN work with Frdm-k64 board.

https://community.nxp.com/thread/496759

https://community.nxp.com/thread/493034

Regards

Daniel

[mjbcswitzerland]

Hi Johannes

Clone the uTasker project from GitHub (free and open source) since it contains a FlexCAN solution for your HW which works correctly.

- http://www.utasker.com/docs/uTasker/uTaskerCAN.PDF
- https://www.youtube.com/watch?v=Ha8cv_XEvco

If you have professional requirements it has a turn-key CANopen solution in its supported version.

Regards

Mark

Complete K64 solutions, training and support:http://www.utasker.com/kinetis.html
Kinetis K64:
- http://www.utasker.com/kinetis/FRDM-K64F.html
- http://www.utasker.com/kinetis/TWR-K64F120M.html
- http://www.utasker.com/kinetis/TEENSY_3.5.html
- http://www.utasker.com/kinetis/Hexiwear-K64F.html